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ComboBox Class

May 11, 2014

This API supports the .NET Framework infrastructure and is not intended to be used directly from your code.

Represents a selection control that combines a non-editable text box and a drop-down containing a list box that allows users to select an item from a list.

Namespace:  System.Windows.Controls
Assembly:  System.Windows (in System.Windows.dll)
XMLNS for XAML: Not mapped to an xmlns.

[TemplatePartAttribute(Name = "DropDownToggle", Type = typeof(ToggleButton))]
[TemplatePartAttribute(Name = "ContentPresenter", Type = typeof(ContentPresenter))]
[TemplatePartAttribute(Name = "Popup", Type = typeof(Popup))]
[TemplatePartAttribute(Name = "ContentPresenterBorder", Type = typeof(FrameworkElement))]
[TemplateVisualStateAttribute(Name = "InvalidUnfocused", GroupName = "ValidationStates")]
[TemplateVisualStateAttribute(Name = "Normal", GroupName = "CommonStates")]
[TemplateVisualStateAttribute(Name = "MouseOver", GroupName = "CommonStates")]
[TemplateVisualStateAttribute(Name = "Disabled", GroupName = "CommonStates")]
[TemplateVisualStateAttribute(Name = "Unfocused", GroupName = "FocusStates")]
[TemplateVisualStateAttribute(Name = "Focused", GroupName = "FocusStates")]
[TemplateVisualStateAttribute(Name = "FocusedDropDown", GroupName = "FocusStates")]
[TemplateVisualStateAttribute(Name = "Valid", GroupName = "ValidationStates")]
[TemplatePartAttribute(Name = "ScrollViewer", Type = typeof(ScrollViewer))]
[TemplateVisualStateAttribute(Name = "InvalidFocused", GroupName = "ValidationStates")]
public class ComboBox : Selector

The ComboBox type exposes the following members.

  NameDescription
Public methodComboBoxInitializes a new instance of the ComboBox class.
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  NameDescription
Public propertyActualHeightGets the rendered height of a FrameworkElement. (Inherited from FrameworkElement.)
Public propertyActualWidthGets the rendered width of a FrameworkElement. (Inherited from FrameworkElement.)
Public propertyAllowDropGets or sets a value that determines whether this UIElement can be a drop target for purposes of drag-and-drop operations. (Inherited from UIElement.)
Public propertyBackground (Inherited from Control.)
Public propertyBorderBrush (Inherited from Control.)
Public propertyBorderThickness (Inherited from Control.)
Public propertyCacheModeGets or sets a value that indicates that rendered content should be cached when possible. (Inherited from UIElement.)
Public propertyCharacterSpacing (Inherited from Control.)
Public propertyClipGets or sets the Geometry used to define the outline of the contents of a UIElement. (Inherited from UIElement.)
Public propertyCursorInfrastructure. Gets or sets the cursor image that displays while the pointer is over a FrameworkElement. (Inherited from FrameworkElement.)
Public propertyDataContextGets or sets the data context for a FrameworkElement when it participates in data binding. (Inherited from FrameworkElement.)
Protected propertyDefaultStyleKey (Inherited from Control.)
Public propertyDesiredSizeGets the size that this UIElement computed during the measure pass of the layout process. (Inherited from UIElement.)
Public propertyDispatcherGets the Dispatcher this object is associated with. (Inherited from DependencyObject.)
Public propertyDisplayMemberPathGets or sets the name or path of the property that is displayed for each data item. (Inherited from ItemsControl.)
Public propertyFlowDirectionGets or sets the direction that text and other user interface elements flow within any parent element that controls their layout. (Inherited from FrameworkElement.)
Public propertyFontFamily (Inherited from Control.)
Public propertyFontSize (Inherited from Control.)
Public propertyFontStretch (Inherited from Control.)
Public propertyFontStyle (Inherited from Control.)
Public propertyFontWeight (Inherited from Control.)
Public propertyForeground (Inherited from Control.)
Public propertyHeightGets or sets the suggested height of a FrameworkElement. (Inherited from FrameworkElement.)
Public propertyHorizontalAlignmentGets or sets the horizontal alignment characteristics that are applied to a FrameworkElement when it is composed in a layout parent, such as a panel or items control. (Inherited from FrameworkElement.)
Public propertyHorizontalContentAlignment (Inherited from Control.)
Public propertyIsDropDownOpenGets or sets a value that indicates whether the drop-down portion of the combo box is currently open.
Public propertyIsEditableGets a value that indicates whether the user can edit text in the text box portion of a combo box. This property always returns false.
Public propertyIsEnabled (Inherited from Control.)
Public propertyIsHitTestVisibleGets or sets whether the contained area of this UIElement can return true values for hit testing. (Inherited from UIElement.)
Public propertyIsSelectionBoxHighlightedGets a value that indicates whether the SelectionBoxItem is highlighted.
Public propertyIsSynchronizedWithCurrentItemGets or sets a value that indicates whether the Selector should keep the SelectedItem synchronized with the current item in the Items property. (Inherited from Selector.)
Public propertyIsTabStop (Inherited from Control.)
Public propertyItemContainerGeneratorGets the ItemContainerGenerator associated with this ItemsControl. (Inherited from ItemsControl.)
Public propertyItemContainerStyleGets or sets the style applied to the container generated for each item in the combo box.
Public propertyItemsGets the collection used to generate the content of the control. (Inherited from ItemsControl.)
Public propertyItemsPanelGets or sets the template that defines the panel that controls the layout of items. (Inherited from ItemsControl.)
Public propertyItemsSourceGets or sets a collection used to generate the content of the ItemsControl. (Inherited from ItemsControl.)
Public propertyItemTemplateGets or sets the DataTemplate used to display each item. (Inherited from ItemsControl.)
Public propertyLanguageGets or sets localization/globalization language information that applies to a FrameworkElement. (Inherited from FrameworkElement.)
Public propertyMarginGets or sets the outer margin of a FrameworkElement. (Inherited from FrameworkElement.)
Public propertyMaxDropDownHeightGets or sets the maximum height of the drop-down that lists combo box items.
Public propertyMaxHeightGets or sets the maximum height constraint of a FrameworkElement. (Inherited from FrameworkElement.)
Public propertyMaxWidthGets or sets the maximum width constraint of a FrameworkElement. (Inherited from FrameworkElement.)
Public propertyMinHeightGets or sets the minimum height constraint of a FrameworkElement. (Inherited from FrameworkElement.)
Public propertyMinWidthGets or sets the minimum width constraint of a FrameworkElement. (Inherited from FrameworkElement.)
Public propertyNameGets or sets the identifying name of the object. When a XAML processor creates the object tree from XAML markup, run-time code can refer to the XAML-declared object by this name. (Inherited from FrameworkElement.)
Public propertyOpacityGets or sets the degree of the object's opacity. (Inherited from UIElement.)
Public propertyOpacityMaskGets or sets the brush used to alter the opacity of regions of this object. (Inherited from UIElement.)
Public propertyPadding (Inherited from Control.)
Public propertyParentGets the parent object of this FrameworkElement in the object tree. (Inherited from FrameworkElement.)
Public propertyProjectionGets or sets the perspective projection (3-D effect) to apply when rendering this UIElement. (Inherited from UIElement.)
Public propertyRenderSizeGets the final render size of a UIElement. (Inherited from UIElement.)
Public propertyRenderTransformGets or sets transform information that affects the rendering position of a UIElement. (Inherited from UIElement.)
Public propertyRenderTransformOriginGets or sets the origin point of any possible render transform declared by RenderTransform, relative to the bounds of the UIElement. (Inherited from UIElement.)
Public propertyResourcesGets the locally defined resource dictionary. In XAML, you can establish resource items as child object elements of a frameworkElement.Resources property element, through XAML implicit collection syntax. (Inherited from FrameworkElement.)
Public propertySelectedIndexGets or sets the index of the selected item. (Inherited from Selector.)
Public propertySelectedItemGets or sets the selected item. (Inherited from Selector.)
Public propertySelectedValueGets or sets the value of the selected item, obtained by using the SelectedValuePath. (Inherited from Selector.)
Public propertySelectedValuePathGets or sets the property path that is used to get the SelectedValue property of the SelectedItem property. (Inherited from Selector.)
Public propertySelectionBoxItemGets the item displayed in the selection box.
Public propertySelectionBoxItemTemplateGets the template applied to the selection box content.
Public propertyStyleGets or sets an instance Style that is applied for this object during rendering. (Inherited from FrameworkElement.)
Public propertyTabIndex (Inherited from Control.)
Public propertyTabNavigation (Inherited from Control.)
Public propertyTagGets or sets an arbitrary object value that can be used to store custom information about this object. (Inherited from FrameworkElement.)
Public propertyTemplate (Inherited from Control.)
Public propertyTriggersGets the collection of triggers for animations that are defined for a FrameworkElement. (Inherited from FrameworkElement.)
Public propertyUseLayoutRoundingGets or sets a value that determines whether rendering for the object and its visual subtree should use rounding behavior that aligns rendering to whole pixels. (Inherited from UIElement.)
Public propertyUseOptimizedManipulationRoutingGets or sets a value that indicates whether the system should handle input events or whether the FrameworkElement should handle input events. (Inherited from FrameworkElement.)
Public propertyVerticalAlignmentGets or sets the vertical alignment characteristics that are applied to a FrameworkElement when it is composed in a parent object such as a panel or items control. (Inherited from FrameworkElement.)
Public propertyVerticalContentAlignment (Inherited from Control.)
Public propertyVisibilityGets or sets the visibility of a UIElement. A UIElement that is not visible does not render and does not communicate its desired size to layout. (Inherited from UIElement.)
Public propertyWidthGets or sets the width of a FrameworkElement. (Inherited from FrameworkElement.)
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  NameDescription
Public methodAddHandlerAdds a routed event handler for a specified routed event, adding the handler to the handler collection on the current element. Specify handledEventsToo as true to have the provided handler be invoked for routed event that had already been marked as handled by another element along the event route. (Inherited from UIElement.)
Public methodApplyTemplate (Inherited from Control.)
Public methodArrangePositions child objects and determines a size for a UIElement. Parent objects that implement custom layout for their child elements should call this method from their layout override implementations to form a recursive layout update. (Inherited from UIElement.)
Protected methodArrangeOverrideArranges and sizes the combo box control and its contents. (Overrides FrameworkElement.ArrangeOverride(Size).)
Public methodCaptureMouseSets touch capture to a UIElement. (Inherited from UIElement.)
Public methodCheckAccessDetermines whether the calling thread has access to this object. (Inherited from DependencyObject.)
Protected methodClearContainerForItemOverrideRemoves all templates, styles, and bindings for the object displayed as a ComboBoxItem. (Overrides Selector.ClearContainerForItemOverride(DependencyObject, Object).)
Public methodClearValueClears the local value of a dependency property. (Inherited from DependencyObject.)
Public methodEquals(Object)Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
Protected methodFinalizeAllows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.)
Public methodFindNameRetrieves an object that has the specified identifier name. (Inherited from FrameworkElement.)
Public methodFocus (Inherited from Control.)
Public methodGetAnimationBaseValueReturns any base value established for a Windows Phone dependency property, which would apply in cases where an animation is not active. (Inherited from DependencyObject.)
Public methodGetBindingExpressionRetrieves the BindingExpression for a dependency property where a binding is established. (Inherited from FrameworkElement.)
Protected methodGetContainerForItemOverrideRetrieves an empty combo box item. (Overrides ItemsControl.GetContainerForItemOverride().)
Public methodGetHashCodeServes as a hash function for a particular type. (Inherited from Object.)
Protected methodGetTemplateChild (Inherited from Control.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodGetValueReturns the current effective value of a dependency property from a DependencyObject. (Inherited from DependencyObject.)
Public methodInvalidateArrangeInvalidates the arrange state (layout) for a UIElement. After the invalidation, the UIElement will have its layout updated, which will occur asynchronously. (Inherited from UIElement.)
Public methodInvalidateMeasureInvalidates the measurement state (layout) for a UIElement. (Inherited from UIElement.)
Protected methodIsItemItsOwnContainerOverrideDetermines whether the specified item is (or is eligible to be) its own item container. (Overrides ItemsControl.IsItemItsOwnContainerOverride(Object).)
Public methodMeasureUpdates the DesiredSize of a UIElement. Typically, objects that implement custom layout for their layout children call this method from their own MeasureOverride implementations to form a recursive layout update. (Inherited from UIElement.)
Protected methodMeasureOverrideProvides the behavior for the Measure pass of Windows Phone layout. Classes can override this method to define their own Measure pass behavior. (Inherited from FrameworkElement.)
Protected methodMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodOnApplyTemplateBuilds the visual tree for the ComboBox when a new template is applied. (Overrides Selector.OnApplyTemplate().)
Protected methodOnCreateAutomationPeerReturns a ComboBoxAutomationPeer for use by the Windows Phone automation infrastructure. (Overrides UIElement.OnCreateAutomationPeer().)
Protected methodOnDoubleTap (Inherited from Control.)
Protected methodOnDragEnter (Inherited from Control.)
Protected methodOnDragLeave (Inherited from Control.)
Protected methodOnDragOver (Inherited from Control.)
Protected methodOnDrop (Inherited from Control.)
Protected methodOnDropDownClosedRaises the DropDownClosed event.
Protected methodOnDropDownOpenedRaises the DropDownOpened event.
Protected methodOnGotFocusProvides handling for the GotFocus event. (Overrides Control.OnGotFocus(RoutedEventArgs).)
Protected methodOnHold (Inherited from Control.)
Protected methodOnItemsChangedUpdates the current selected item when the Items collection has changed. (Inherited from Selector.)
Protected methodOnKeyDownProvides handling for the KeyDown event. (Overrides Control.OnKeyDown(KeyEventArgs).)
Protected methodOnKeyUp (Inherited from Control.)
Protected methodOnLostFocusProvides handling for the LostFocus event. (Overrides Control.OnLostFocus(RoutedEventArgs).)
Protected methodOnLostMouseCapture (Inherited from Control.)
Protected methodOnManipulationCompleted (Inherited from Control.)
Protected methodOnManipulationDelta (Inherited from Control.)
Protected methodOnManipulationStarted (Inherited from Control.)
Protected methodOnMouseEnterProvides handling for the MouseEnter event that occurs when the user’s finger enters this control. (Overrides Control.OnMouseEnter(MouseEventArgs).)
Protected methodOnMouseLeaveProvides handling for the MouseLeave event that occurs when the user’s finger leaves the combo box. (Overrides Control.OnMouseLeave(MouseEventArgs).)
Protected methodOnMouseLeftButtonDownProvides handling for the MouseLeftButtonDown event that occurs when the user touches the screen within the bounds the combo box. (Overrides Control.OnMouseLeftButtonDown(MouseButtonEventArgs).)
Protected methodOnMouseLeftButtonUp (Inherited from Control.)
Protected methodOnMouseMove (Inherited from Control.)
Protected methodOnMouseRightButtonDown (Inherited from Control.)
Protected methodOnMouseRightButtonUp (Inherited from Control.)
Protected methodOnMouseWheelInfrastructure. Provides handling for the MouseWheel event. (Overrides Control.OnMouseWheel(MouseWheelEventArgs).)
Protected methodOnTap (Inherited from Control.)
Protected methodOnTextInput (Inherited from Control.)
Protected methodOnTextInputStart (Inherited from Control.)
Protected methodOnTextInputUpdate (Inherited from Control.)
Protected methodPrepareContainerForItemOverridePrepares the specified element to display the specified item. (Overrides Selector.PrepareContainerForItemOverride(DependencyObject, Object).)
Public methodReadLocalValueReturns the local value of a dependency property, if a local value is set. (Inherited from DependencyObject.)
Public methodReleaseMouseCaptureRemoves touch capture from a UIElement. After this call, typically no object holds touch capture. (Inherited from UIElement.)
Public methodRemoveHandlerRemoves the specified routed event handler from this UIElement. (Inherited from UIElement.)
Public methodSetBindingAttaches a binding to a FrameworkElement, using the provided binding object, and returns a BindingExpressionBase for possible later use. (Inherited from FrameworkElement.)
Public methodSetValueSets the local value of a dependency property on a DependencyObject. (Inherited from DependencyObject.)
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)
Public methodTransformToVisualReturns a transform object that can be used to transform coordinates from the UIElement to the specified object. (Inherited from UIElement.)
Public methodUpdateLayoutEnsures that all positions of child objects of a UIElement are properly updated for layout. (Inherited from UIElement.)
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  NameDescription
Public eventBindingValidationErrorOccurs when a data validation error is reported by a binding source. (Inherited from FrameworkElement.)
Public eventDoubleTapOccurs when a DoubleTap gesture is committed while over this UIElement. (Inherited from UIElement.)
Public eventDropDownClosedOccurs when the drop-down portion of the combo box closes.
Public eventDropDownOpenedOccurs when the drop-down portion of the combo box opens.
Public eventGotFocusOccurs when a UIElement receives focus. (Inherited from UIElement.)
Public eventHoldOccurs when a Hold gesture is committed while over this UIElement. (Inherited from UIElement.)
Public eventIsEnabledChanged (Inherited from Control.)
Public eventKeyDownOccurs when a keyboard key is pressed while the UIElement has focus. (Inherited from UIElement.)
Public eventKeyUpOccurs when a keyboard key is released while the UIElement has focus. (Inherited from UIElement.)
Public eventLayoutUpdatedOccurs when the layout of the Windows Phone visual tree changes. (Inherited from FrameworkElement.)
Public eventLoadedOccurs when a FrameworkElement has been constructed and added to the object tree. (Inherited from FrameworkElement.)
Public eventLostFocusOccurs when a UIElement loses focus. (Inherited from UIElement.)
Public eventLostMouseCaptureOccurs when the UIElement loses touch capture. (Inherited from UIElement.)
Public eventManipulationCompletedOccurs when a manipulation and inertia on the UIElement is complete. (Inherited from UIElement.)
Public eventManipulationDeltaOccurs when the input device changes position during a manipulation. (Inherited from UIElement.)
Public eventManipulationStartedOccurs when an input device begins a manipulation on the UIElement. (Inherited from UIElement.)
Public eventMouseEnterOccurs when a screen tap occurs within the bounding area of a UIElement. (Inherited from UIElement.)
Public eventMouseLeaveOccurs when a touch event occurs outside the bounding area of a UIElement. (Inherited from UIElement.)
Public eventMouseLeftButtonDownOccurs when a UIElement is tapped. (Inherited from UIElement.)
Public eventMouseLeftButtonUpOccurs when the finger is lifted off of a UIElement (or while a UIElement holds touch capture). (Inherited from UIElement.)
Public eventMouseMoveOccurs when the coordinate position of the finger on the screen while touching a UIElement (or while a UIElement holds touch capture). (Inherited from UIElement.)
Public eventMouseWheelInfrastructure. Occurs when the user rotates the mouse wheel while the mouse pointer is over a UIElement, or the UIElement has focus. (Inherited from UIElement.)
Public eventSelectionChangedOccurs when the currently selected item changes. (Inherited from Selector.)
Public eventSizeChangedOccurs when either the ActualHeight or the ActualWidth properties change value on a FrameworkElement. (Inherited from FrameworkElement.)
Public eventTapOccurs when a Tap gesture is committed while over this UIElement. (Inherited from UIElement.)
Public eventTextInputOccurs when a UI element gets text in a device-independent manner. (Inherited from UIElement.)
Public eventTextInputStartOccurs when a UI element initially gets text in a device-independent manner. (Inherited from UIElement.)
Public eventTextInputUpdateOccurs when text continues to be composed via an input method editor (IME). (Inherited from UIElement.)
Public eventUnloadedOccurs when this object is no longer connected to the main object tree. (Inherited from FrameworkElement.)
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  NameDescription
Public fieldStatic memberIsDropDownOpenPropertyIdentifies the IsDropDownOpen dependency property.
Public fieldStatic memberIsSelectionActivePropertyIdentifies the IsSelectionActive attached property.
Public fieldStatic memberItemContainerStylePropertyIdentifies the ItemContainerStyle dependency property.
Public fieldStatic memberMaxDropDownHeightPropertyIdentifies the MaxDropDownHeight dependency property.
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  NameDescription
Explicit interface implemetationPrivate methodISupportInitialize.BeginInitSignals the object that initialization is starting. (Inherited from Selector.)
Explicit interface implemetationPrivate methodISupportInitialize.EndInitSignals the object that initialization is complete. (Inherited from Selector.)
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The text box either displays the current selection or is empty if there is no selected item.

NoteNote:

If you populate a combo box with items that inherit from UIElement, the selected item can only appear in the visual tree one time. This means if an item is selected, it will appear in the selection box, and not in the drop-down list of items. When it is no longer the selected item, it will reappear in the drop-down list. If items do not inherit from UIElement, they can appear in both the selection box and the drop-down list at the same time.

ComboBox is an ItemsControl, which means it has an associated item container, ComboBoxItem, which contains individual pieces of content in the control. A ComboBoxItem is created for each item in a collection and can be retrieved, whether or not you create it explicitly. You can retrieve ComboBoxItem container objects by using the ItemContainerGenerator property associated with the ComboBox control. You populate the ComboBox by using the Items or ItemsSource properties.

You can retrieve the combo box's selected item by using the SelectedItem property, or retrieve the index of the selected item by using the SelectedIndex property.

Customizing the ComboBox Control

You can apply a style to each item displayed in the ComboBox by setting the ItemContainerStyle property.

To apply the same property settings to multiple ComboBox controls, use the Style property. To change the visual structure and visual behavior of a ComboBox, copy and modify its default style and template.

Dependency properties for this control might be set by the default style of the control. If a dependency property for a ComboBox is set by its default style, the property might change from its default value when the ComboBox appears in the application. For more information, see Dependency properties for Windows Phone 8.

NoteNote:

Setting a visual property will only have an effect if that property is both present in ComboBox control's default template and is set by using a TemplateBinding.

Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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